public vessel ’ means a vessel owned or bareboat chartered and operated by the United States, by a State or political subdivision thereof, or by a foreign nation, except when such vessel is engaged in commerce;
U.S.-flag vessel means a vessel of the United States or belonging to the United States, including any vessel registered or having national status under the laws of the United States.
Foreign flag vessel means any vessel that is not a U.S.-flag vessel.
Cargo vessel means a self-propelled ship in commerce, other than a tank vessel or a passenger vessel, three hundred or more gross tons, including but not limited to, commercial fish processing vessels and freighters.
Commercial vessel means any vessel not owned and operated by the United States military or the United States Coast Guard.